This paper presents an investigation of the effects of temperature gradient distribution by the aid of a secondary burner on exergetic and environmental functions of the cement production process. For this reason, the burning system of the cement production (kiln & preheater) process was simulated in four thermal areas. Three lines of cement production with 2,000, 2,300 and 2,600 ton/day were investigated. Fuel injection ratio into the secondary burner, from 10 to 40 percent was studied for each line. The obtained results show that, for cyclone preheaters, fuel injection into the secondary burner up to a proportion resulting in the minimum temperature required for alite formation (2,200 ℃) in the kiln burning zone is suitable. For shaft preheaters, however, according to percent calcinations, there exists an optimum proportion for 15 to 20 percent injection fuel into secondary burner. Finally, it was shown that the secondary burner application can reduce the exergy losses about 25 percent, which leads to a reduction of the green house gases
of about 35000 cubic meters per year for each ton per day of clinker production.
Bosnjakovic F, Technical Thermodynamics, Holt, Rinehart & Winston, New York, 1965
Szargut J, Morris DR, Steward FR, Exergy Analysis of Thermal, Chemical and Metallurgical Processes, Hemisphere Publishing Corporation, New York, London, 1988
Kotas TJ, the Exergy Method of Thermal Plant Analysis. Krieger Publishing Company, Malabar, Florida, 1995
Bejan A, Entropy Generation through Heat & Fluid Flow, Wiley, New York, 1982
Bejan A, Advanced Engineering Thermodynamics, Wiley, New York, 2006
Bejan A, Tsatsaronis G, Moran M, Thermal Design & Optimization, Wiley, New York, 1996
Kaantee U, Zevenhoven R, Backman R, Hupa M, Cement manufacturing using alternative fuels and the advantages of process modeling, Recovery, Recycling, Re-integration, Feb. 12-15, Geneva, Switzerland, 2002
Choate WT, Energy and Emission Reduction Opportunities for the Cement Industry, U.S. Department of Energy, Energy Efficiency and Renewable Energy, 2003
Koroneos C, Roumbas G, Moussiopoulos N, Int. J. Exergy., 2(1), 55, 2005
Kawaes T, Cement Process and Energy Saving, the Energy Conservation Center, Japan, 2006
Sogut Z, Oktay Z, Int. J. Exergy., 5(5), 218, 2008
Zeman F, Lakcner K, The Reduced Emission Oxygen Kiln, A White Paper Report for the Cement Sustainability Initiative of the World Business Council on Sustainable Development, Lenfest Center for Sustainable Energy Columbia University in New York Report No. 2008.01., 2008
Worrell E, Galitsky C, Price L, Energy efficiency improvement opportunities for the cement industry, Environmental Energy Technologies Division Lawrence Berkeley National Laboratory, 2008
Kurt EP, Cement Manufacturers’ Handbook, Chemical Publishing Co. Inc. New York, 1979
Kohlhaas B, Labahn O, Cement Engineers’ Handbook, 4th Ed. Int. Public Service, 1982
Duda WH, Cement Data Book (1), Bauverlag GmbH, 1985
Boateng AA, Rotary Kilns: Transport Phenomena and Transport Processes, Elsevier, 2008
Alsop PA, The Cement Plant Operation Hand Book, International Cement Review, 2010
Ashrafizadeh SA, Sanat Siman., 90, 8, 2007
Sato N, Chemical energy and exergy an introduction to chemical thermodynamics for engineering, Elsevier, First Ed., 112, 2004
Ashrafizadeh SA, Designing of a clinker burning pilot plant, M.Sc. thesis, Adviser: Dr. Taeb A, Cement Research Center, Chemical Eng. Group, Iran University of Science and Technology, Sep., 1997